I want to change the cabin filter but before that I do that I wanted to clean out the vent system.

I have a vent spray and wanted to know where the outside air induction vent and the recirculation vents are located.

Has anyone done something similar to this before?

 

Most of the leaves and debris will accumulate in the air box just before the filter. If you've never done it, cleaning outside of this will not be very beneficial as you most likely have plenty of dust and particulate that's made it's way past the filter.

if/when you get to the point of replacing any dashboard lightbulbs: it's pretty easy to access all vent ducts beyond the blower unit once you remove the dash console cover; cleaning those out will help a great deal with dust in the cabin.